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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f91400960c831f7784e1c571499d172746530afe296536a40dcd70655f92420' 
  AND token = '9jGiOq9ErdEQIC/Uc4Fojq8H7BrEqacK11YgePagmx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}